(Cat? OR feline) AND NOT dog?
Cat? W/5 behavior
(Cat? OR feline) AND traits
Cat AND charact*

This guide provides a more detailed description of the syntax that is supported along with examples.

This search box also supports the look-up of an IP.com Digital Signature (also referred to as Fingerprint); enter the 72-, 48-, or 32-character code to retrieve details of the associated file or submission.

Concept Search - What can I type?

For a concept search, you can enter phrases, sentences, or full paragraphs in English. For example, copy and paste the abstract of a patent application or paragraphs from an article.

Concept search eliminates the need for complex Boolean syntax to inform retrieval. Our Semantic Gist engine uses advanced cognitive semantic analysis to extract the meaning of data. This reduces the chances of missing valuable information, that may result from traditional keyword searching.

Method for very low-voltage bandgap reference and temperature sensor circuits

Publishing Venue

Abstract

Disclosed is a method for very low-voltage bandgap reference and temperature sensor circuits. Benefits include improved functionality and improved performance.

Country

United States

Language

English (United States)

This text was extracted from a Microsoft Word document.

At least one non-text object (such as an image or picture) has been suppressed.

This is the abbreviated version, containing approximately
42% of the total text.

Method for very low-voltage bandgap reference and
temperature sensor circuits

Disclosed is a method for very low-voltage bandgap reference and
temperature sensor circuits. Benefits include improved functionality and
improved performance.

Background

Conventional bandgap
reference circuits produce output only at a fixed bandgap voltage of
approximately 1.2V. Although modified circuits provide scalable output that can
be lower than 1.2V, PMOS transistor current mirrors can vary due to process
mismatch and output error.

An accurate reference
voltage signal is required for many analog circuits, such as data converters
and power supply circuits. As the integration of radio frequency (RF) and
analog circuits continues in smaller CMOS technologies, less sensitive circuits
for reference generation are required.

In the conventional
bandgap circuit, anode side nodes of bandgap core are sensed by an operational amplifier
(op-amp). The voltage on the other side of the two resistors, R1 and
R2, is forced so that feedback equalizes the voltage of the two
sense nodes. In general, the sense node and the force node do not have to be on
the anode side and resistor end, as long as the following conditions are met:

• Feedback is negative.

• Voltage across the core
branches are equal.

• Current through the
two diodes are equal.

General description

The disclosed method
is very low-voltage bandgap reference and temperature sensor circuits. They generate
output voltage lower than conventional designs. The same circuits can be used
as temperature sensors because the buffered output node has an inherent
negative temperature coefficient.

The major advantage
of the disclosed method is that it depends only on current matching between
passive resistors, which reduces the circuits’ sensitivity.

The disclosed
method includes four configurations of bandgap reference circuits that generate
output voltage lower then conventional designs. Additionally, the circuits
function as temperature sensor circuits.

By changing the sense
node and force node configurations, a temperature-independent low-voltage
reference signal can be generated.

Offset sensitivity is
defined as the ratio variation of absolute value of Vref when a 0.1-mV offset occurs
in the op-amp.

Circuit 1

The sense node for
this circuit is comprised of the cathode-side nodes of the bandgap core. The
anode-side nodes are connected as a force node. The polarity of the differential
op-amp is reversed compared to a conventional bandgap due to direct voltage
fe...